A self-excited vibration testing device

Abstract

The present application belongs to the technical field of testing of mechanical parts, and particularly relates to a self-excited vibration testing device, comprising a vibration exciting module, a vibration receiving module and a displacement module; the vibration exciting module comprises a main support, a driver for outputting rotation is installed on the main support, and a driving ring is installed on the output end of the driver; the vibration receiving module comprises a first lifting mechanism and a workbench, the first lifting mechanism comprises a lifting table and a lifting driver, and the lifting driver is used for driving the lifting table to make reciprocating linear motion; the workbench is arranged on the lifting table, a mounting seat for mounting a to-be-tested part is rotatably connected to the workbench, and a pressure sensor is arranged between the workbench and the mounting seat; the displacement module comprises a displacement support and a non-contact displacement sensor, and the non-contact displacement sensor is installed on the displacement support. The present application provides a testing device capable of accurately measuring self-excited vibration parameters of parts and better revealing vibration mechanism, and further explores the influence of self-excited vibration on equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of testing mechanical components, and in particular relates to a self-excited vibration testing device. Background Art

[0002] Self-excited vibration is a nonlinear vibration maintained by the excitation generated by the system itself. Unlike free vibration and forced vibration, self-excited vibration can produce stable periodic vibration without external excitation, and its vibration frequency and amplitude are often closely related to the structure and operating conditions of the system.

[0003] For example, in the modern industrial field, sealing components, as key devices to prevent fluid leakage, are prone to self-excited vibrations when the equipment in which they are located is running at high speed. The self-excited vibrations of sealing components may be caused by a variety of factors, such as unstable speed, load changes, etc. The impact of self-excited vibrations on sealing components may cause wear on the sealing surface and leakage accidents. When the vibration amplitude exceeds a certain threshold, the contact pressure of the sealing surface will change, causing the sealing effect to decrease, and the fluid will easily leak out through the sealing gap under the action of the pressure difference. In addition, self-excited vibrations may also lead to seal failure, such as breakage and loosening of the sealing ring, further exacerbating the leakage problem.

[0004] The frequent occurrence of self-excited vibration in equipment seriously affects the life and safety of the equipment. However, since the components of most equipment that self-excite vibrate during actual operation will generate acceleration due to vibration, resulting in changes in displacement and load, these parameters cannot be accurately measured under actual working conditions. Therefore, it is difficult to reveal the mechanism and cause of the self-excited vibration of components by simulation and emulation alone. Summary of the Invention

[0005] The present invention aims to provide a self-excited vibration testing device, which can accurately measure the self-excited vibration parameters of components and better reveal the vibration mechanism; and further explore the impact of self-excited vibration on equipment.

[0006] In order to achieve the above-mentioned object, the present invention provides a self-excited vibration test device, comprising an excitation module, an excited module and a displacement module:

[0007] The excitation module includes a main bracket, on which a driver for outputting rotation is installed, the output end of the driver is downwardly arranged, and an active ring is installed on the output end of the driver;

[0008] The stimulated module includes a first lifting mechanism and a workbench. The first lifting mechanism includes a lifting platform and a lifting driver. The lifting driver is used to drive the lifting platform to perform reciprocating linear motion. The workbench is arranged on the lifting platform. A mounting seat for mounting the component to be tested is rotatably connected to the workbench. A pressure sensor is provided between the workbench and the mounting seat.

[0009] The displacement module comprises a displacement bracket and a non-contact displacement sensor. The non-contact displacement sensor is mounted on the displacement bracket, and a measuring end of the non-contact displacement sensor faces the workbench.

[0010] The working principle and beneficial effects of this solution are as follows: the component under test is mounted on a mounting base, and the linear motion of the first lifting mechanism causes the component under test to counteract the active ring. A driver simulates the speed conditions experienced by the component under test, controls the lifting stroke of the first lifting mechanism, and reads the pressure sensor reading to simulate the load on the component under test, thereby simulating the self-excited vibration conditions of the component under test. The runout data of the component under test under self-excited vibration conditions is detected using a non-contact displacement sensor, thereby measuring the self-excited vibration parameters of the component under test at different speeds and loads.

[0011] This solution can simulate the operating conditions of most equipment, and can also simulate working conditions from low speed to high speed, from low load to high load (the load in the engine seal is the preload of the installation spring). It has wide applicability and strong practicality.

[0012] This solution adopts a modular and separate design. The spacing is adjusted and controlled by the first lifting mechanism. It can also realize the vibration caused by special friction forms such as eccentric friction and non-horizontal friction, and greatly restore the operating conditions of various components, especially sealing components.

[0013] This solution utilizes a non-contact displacement sensor that does not touch the components to be tested, thus avoiding distortion of working conditions caused by contact with the components to be tested and achieving accurate, fast and efficient data.

[0014] By rationally arranging pressure sensors, this solution can accurately and quickly measure load changes caused by self-excited vibration and capture nonlinear changes in vibration.

[0015] Optionally, the workbench also includes an auxiliary plate, which is arranged between the mounting base and the pressure sensor. The auxiliary plate is equipped with a triangular support plate, and the triangular support plate is equipped with a torque sensor. A torque auxiliary block is provided on the side of the mounting base, and the auxiliary block can contact the torque sensor when the mounting base rotates. When the active ring of the excitation module contacts and rotates with the component to be measured, it drives the mounting base and the component to be measured to rotate, and the torque auxiliary block and the torque sensor, thereby obtaining torque data through the torque sensor, thereby calculating the friction force of the component to be measured, so as to accurately measure parameters, and further better reveal the mechanism of vibration and the aggravation of friction due to vibration, reveal the influence of self-excited vibration of various components, especially sealing components, under harsh working conditions, and guide the development of its theory and principles, thereby reducing damage to components and extending the life of the equipment.

[0016] Optionally, the displacement module also includes a second lifting mechanism for driving the displacement bracket in reciprocating linear motion. This facilitates adjustment of the non-contact displacement sensor to the needs of different components under test and further facilitates the implementation of special friction modes such as eccentric friction and non-horizontal friction.

[0017] Optionally, a triaxial accelerometer is installed around the mounting base to collect acceleration changes caused by vibration in real time. This allows for the measurement of self-excited vibration parameters of the component under test at different speeds and loads.

[0018] Optionally, the first lifting mechanism and the second lifting mechanism include one of a linear motor, an air cylinder, an oil cylinder, an electric cylinder, a screw mechanism or a threaded mechanism.

[0019] Optionally, it further includes a slide and a slide seat, the excited module is installed on the slide, the main bracket is installed on the slide seat, and the slide is slidably connected to the slide seat.

[0020] Optionally, the active ring is detachably connected to the driver, making it easy to replace active rings of different sizes at any time.

[0021] Optionally, a spring support plate and a spring are further included, with the spring support plate disposed between the mounting base and the auxiliary plate, the spring disposed between the spring support plate and the auxiliary plate, and the mounting base being mounted on the spring support plate. The springs relatively isolate the mounting base and the vibration of the component under test from the outside world, reducing the impact of environmental factors on the vibration of the component under test, thereby further ensuring the accuracy of the test data.

[0022] Optionally, the component to be tested and the mounting seat are integrally formed.

[0023] Optionally, a metal ring is provided on the coaxial sleeve of the mounting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the structure of a self-excited vibration testing device according to an embodiment of the present invention;

[0025] Figure 2 A structural schematic diagram of a self-excited vibration testing device according to another embodiment of the present invention;

[0026] Figure 3 Schematic diagram of the structure of the excited module in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following is further described in detail through specific implementation methods:

[0028] The marks in the drawings of the specification include: excitation module 1, main bracket 11, slide 12, slide seat 13, servo motor 14, active ring 15, excited module 2, first lifting mechanism 21, workbench 22, lifting platform 23, mounting seat 24, metal ring 25, three-axis acceleration sensor 26, pressure sensor 27, torque sensor 28, auxiliary plate 29, spring support plate 210, spring 211, triangular support plate 212, torque auxiliary block 213, displacement module 3, second lifting mechanism 31, displacement bracket 32, non-contact displacement sensor 33.

[0029] Example

[0030] This embodiment is basically as Figure 1 、 Figure 2 Shown: A self-excited vibration test device, mainly used to measure the self-excited vibration parameters of the end face seal of the rotary engine under actual working conditions. This device includes an excitation module 1, an excited module 2 and a displacement module 3:

[0031] The excitation module 1 comprises a main support 11, a slide 12, and a slide seat 13. The main support 11 is a gate-like structure. A rotary output driver is mounted in the middle of the crossbeam of the main support 11. In this embodiment, it is a servo motor 14 with a rotational speed of up to 24,000 rpm, covering the operating speed of most equipment and capable of precise speed adjustment between 1 and 24,000 rpm. The output shaft of the servo motor 14 is set vertically downward, and the end of the output shaft is removably mounted with a driving ring 15 via screws, allowing for easy replacement of driving rings 15 of different sizes and dimensions.

[0032] Displacement module 3 includes a second lifting mechanism 31, a displacement bracket 32, and a non-contact displacement sensor 33. Non-contact displacement sensor 33 is mounted on displacement bracket 32, with its measuring end facing workbench 22. Non-contact displacement sensor 33 detects the runout data of the end face seal under self-excited vibration conditions, thereby measuring the self-excited vibration parameters of the component under test at different speeds and loads.

[0033] The stimulated module 2 includes a first lifting mechanism 21 and a workbench 22. Figure 3 As shown, the first lifting mechanism 21 includes a lifting platform 23 and a lifting drive. The lifting drive, described below, and the second lifting mechanism 31, are all screw mechanisms in this embodiment. In other embodiments, linear motors, pneumatic cylinders, hydraulic cylinders, electric cylinders, etc. may also be used as needed. The lifting drive is used to drive the lifting platform 23 in reciprocating linear motion. The lifting platform 23 is connected to the lead screw nut of the lead screw mechanism. Rotation of the screw in the lead screw drives the lifting platform 23 in reciprocating linear motion up and down. For ease of operation, a wheel and handle are mounted on the top of the screw.

[0034] The workbench 22 is set on the lifting platform 23. A mounting base 24 for mounting the component to be tested is rotatably connected to the workbench 22. In this embodiment, since the end face seal is made of ceramic material, the mounting base 24 and the end face seal to be tested are integrally formed of ceramic material, and a step is formed at the lower part of the mounting base 24. A metal ring 25 is coaxially fixed on the step. The function of the metal ring 25 is to better reflect the measurement signal of the non-contact displacement sensor 33. A mounting hole is respectively opened in each of the four circumferential directions of the mounting base 24, and a three-axis acceleration sensor 26 is respectively installed in the mounting holes in three of the directions. The three three-axis acceleration sensors 26 can collect acceleration changes caused by vibration in real time and measure the self-excited vibration parameters of the end face seal under different speeds and loads.

[0035] The workbench 22 also includes an auxiliary plate 29, a spring support plate 210, and a spring 211. The auxiliary plate 29 is positioned below the mounting base 24. A pressure sensor 27 is positioned below the auxiliary plate 29, with both ends of the pressure sensor 27 connected to the workbench 22 and the auxiliary plate 29. A triangular support plate 212 is mounted on the auxiliary plate 29, on which a torque sensor 28 is mounted. A torque assist block 213 is located in a remaining mounting hole on the side of the mounting base 24. The assist block 213 contacts the torque sensor 28 when the mounting base 24 rotates. When the active ring 15 of the excitation module 1 contacts and rotates with the component under test, it drives the mounting base 24 and the component under test to rotate. The torque assist block 213 contacts the torque sensor 28, thereby acquiring torque data from the torque sensor 28 and calculating the friction force of the component under test. This allows for accurate parameter measurement, further revealing the mechanisms of vibration and the increased friction caused by vibration, as well as the impact of self-excited vibration of various components, especially seals, under harsh operating conditions. This guides the development of theories and principles, thereby reducing component damage and extending equipment life. The spring support plate 210 is disposed between the mounting base 24 and the auxiliary plate 29. The spring 211 is disposed between the spring support plate 210 and the auxiliary plate 29. The mounting base 24 is mounted on the spring support plate 210. The spring 211 isolates the mounting base 24 and the vibration of the component under test from the outside world, reducing the impact of environmental factors on the vibration of the component under test, thereby further ensuring the accuracy of the test data.

[0036] This embodiment, comprised of multiple adjustable modules, can simulate most equipment operating conditions, ranging from low to high speeds, low to high loads, and various preloads for the spring 211. Furthermore, the separate design allows for controlled spacing, enabling the implementation of special friction modes such as eccentric and non-horizontal friction, effectively recreating the operating conditions of end seals. Utilizing various sensors, accurate, rapid, and efficient data collection facilitates further research into friction, self-excited vibration mechanisms, and seal failure causes.

[0037] The above are only embodiments of the present invention. The invention is not limited to the fields involved in this implementation case. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the relevant field are aware of all common technical knowledge in the technical field to which the invention belongs before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the relevant field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A self-excited vibration test device, characterized in that: Including excitation module, stimulated module and displacement module: The excitation module includes a main bracket, on which a driver for outputting rotation is installed, the output end of the driver is downwardly arranged, and an active ring is installed on the output end of the driver; The stimulated module includes a first lifting mechanism and a workbench. The first lifting mechanism includes a lifting platform and a lifting driver. The lifting driver is used to drive the lifting platform to perform reciprocating linear motion. The workbench is arranged on the lifting platform. A mounting seat for mounting the component to be tested is rotatably connected to the workbench. A pressure sensor is provided between the workbench and the mounting seat. The displacement module includes a displacement bracket and a non-contact displacement sensor. The non-contact displacement sensor is mounted on the displacement bracket, and the measuring end of the non-contact displacement sensor faces the workbench. The workbench also includes an auxiliary plate, which is arranged between the mounting base and the pressure sensor, and a triangular support plate is installed on the auxiliary plate, and the torque sensor is installed on the triangular support plate. A torque auxiliary block is provided on the side of the mounting base, and the auxiliary block can contact the torque sensor when the mounting base rotates; A triaxial acceleration sensor is installed on the circumference of the mounting seat; It also includes a spring support plate and a spring. The spring support plate is arranged between the mounting seat and the auxiliary plate. The spring is arranged between the spring support plate and the auxiliary plate. The mounting seat is installed on the spring support plate.

2. A self-excited vibration testing device according to claim 1, characterized in that: The displacement module also includes a second lifting mechanism, which is used to drive the displacement bracket to perform reciprocating linear motion.

3. A self-excited vibration testing device according to claim 2, characterized in that: The first lifting mechanism and the second lifting mechanism include one of a linear motor, an air cylinder, an oil cylinder, an electric cylinder, a screw mechanism or a thread mechanism.

4. A self-excited vibration testing device according to claim 3, characterized in that: It also includes a slide and a slide seat. The excited module is installed on the slide, the main bracket is installed on the slide seat, and the slide is slidably connected to the slide seat.

5. The self-excited vibration testing device according to claim 1, characterized in that: The active ring is detachably connected to the driver.

6. A self-excited vibration testing device according to claim 1, characterized in that: The component to be tested and the mounting seat are integrally formed.

7. A self-excited vibration testing device according to claim 6, characterized in that: A metal ring is provided on the coaxial sleeve of the mounting seat.

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